Well-screen.



H. E. HANSON.

rA WELL SCREEN.

APPLICATION FILED DEC.9| l9l6- 11,23,969, Patented Apr. 24,1917.

INVENTOR WITNESSES ATTORNEY ran HENRY E. HANSON, OF BOWDON, NORTH DAKOTA.

WELL-SCREEN.

To all whom it may] concern:

Be it known that I, HENRY E. HANSON, a citizen of the United States, residing at Bowdon, in the county of Wells and State of North Dakota, have invented certain new and useful Improvements in Well-Screens, of which the following is a specification.

This invention relates to an improved well point or screen of the type used in drilled wells and placed below the pipe to keep sand from coming up when the well is pumped and the principal object of the invention is to provide a screen so constructed that it may be adjusted and further to so construct the screen that the convolutions of the spring forming the screen will serve to prevent coarse sand from passing into the body of the screen but permit very fine sand to pass through.

Another object of the invention is to so construct the spring forming the body of the screen that no lodging place will be provided for coarse sand and to further so provide it that fine sand passing between the convolutions will not remain upon the convolutions as the convolutions are provided with transversely curved inner faces causing the fine sand to drop into the body of the screen where it will be pumped up through the well. It is of course understood that the screen will be so adjusted that the only sand passing into the body of the screen, will be very fine sand which will not contaminate the water.

Another object of the invention is to so construct this screen that when once adjusted, the spring will be held in the adjusted position and prevented from moving to increase or decrease the size of the openings between the convolutions.

Another object of the invention is to provide a screen which will be composed of a comparatively few number of parts so constructed that they will be securely connected and prevented from coming apart when once in place. L

Another object of the invention, is to so construct this well point that it may be withdrawn from the well when desired.

This invention is illustrated in the accompanying drawings, wherein Figure 1 is a view showing the improved well point or screen in elevation,

Fig. 2 is a view showing the improved screen in longitudinal section, and,

Specification of Letters Patent.

Patented Apr. 24, 1191?.

, Application filed December-9, 1916. Serial No. 136,021.

Fig. 3 is a transverse sectional viewtaken along the line 33 of Fig. 2.

The body of this screen is in the form of a spring 10, the convolutions of which are provided with fiat outer faces and with curved inner faces as clearly shown in Fig. 2 so that the face between the convolutions will increase inwardly thus providing sloping faces preventing fine sand from lodging upon the convolutions. The coarser sand which might contaminate the Water will be excluded by the screen and as the outer faces are fiat, and as the convolutions terminate in sharp upper edges, the coarse sand will find no lodging place and there fore will not have a tendency to choke the screen. It is of course understood that the spring may be either of a right hand or left hand construction according to the Wishes of the person making the screen.

This spring has its lower end portion fitting upon the base or collar 11 and has its upper end portion screwed upon the head .12, the neck 13 of which is threaded so that a fishing tool may be inserted in the well to engage the threaded neck of the head 12 and withdraw the screen from the well when desired.

An adjusting stem 14 which is threaded is passed through a threaded opening formed in the base 11 and is provided at its outer end With a squared shank 15 which may be engaged by a tur-ningwrench or key in order to rotate the stem when adjusting the screen. The'head 12 carries a hanger bracket or bearing which is positioned within the body 10 and includes a collar 16 positioned about the stem 14 below the head 17 and suspended from the head 12 by the arms 18. An abutment nut 19 and a locking nut 20 are screwed upon the stem 1A and positioned beneath the collar or ring 16 thus providing an abutment which cooperates with the head 17 in retaining the stem in the proper position and causing the base 11 to be moved longitudinally upon the stem when this stem is rotated. It will thus be seen that when the stem is turned in one direction, the base will be moved to compress the spring whereas if moved in the opposite direction, the base will be moved toward space between the convolutions and thus accommodate the screen to the grade of sand in the well.

- This screen will be placed in the bottom of a well, it being first adjusted to approximately'the proper point and will screen the sand when the well is pumped. If it is found that the space between the convolutions is too small or too great, a fishing tool will be inserted in the well and screwed upon the threaded neck 13 thus permitting the screen or point to be withdrawn from the well. The stem 14 can then be rotated to reduce or increase the space between the convolutions of the spring and the well strainer then replaced.

What is claimed is 1. A well screen comprising a body formed of a spiral spring having its convolutions provided with fiat outer faces and curved inner faces, a base engaging the lower end of the spring body and provided with a threaded passage, a threaded stem extending through the threaded passage into the spring body, a hollow head fitting into the upper end of the spring body, arms extending from the head into the spring body, a head formed at the inner end of said stem, a collar carried by said arms and positioned about the stem beneath the head thereof, an abutment positioned upon the stem beneath the collar, and a jam nut positioned upon the stem and engaging the abutment to hold the same in place.

2. A well screen comprising abody formed of a spiral spring, a base engaging the lower end of the spring body and. provided with a threaded passage, a stem extending throughthe threaded passage into the spring body and provided with a head at its inner end, a hollow head at the upper end of the spring body, a bearing bracket including a collar positioned about the inner end of the stem beneath the head thereof, arms leading from the collar to the head at the upper end of the spring body, and an abutment mounted upon the stem beneath the collar.

3. A well screen comprising a body formed of a spiral spring, a base engaging the lower portion of the spring body and provided with a threaded passage, a hollow head having its lower portion provided with external threads for engagement by the convolutions of the spring body, an adjusting stem threaded through the passage of the base and provided with an abutment head at its inner end, an abutment carried by the stem in spaced relation to the abutment head, and a collar loosely mounted upon the stem between the abutment and the abutment head and provided with carrier arms ex tending from the hollow head.

4. A well screen comprising an expansible body having inlets adjusted through longitudinal expansion and contraction of the body, a base engaging the lower portion of the body and provided with a threaded passage, a hollow head engaging the upper portion of the body, an adjusting stem threaded through the passage of the base and having its inner end portion provided with a stationary abutment, a movable abutment carried by the stem in spaced relation to the stationary abutment, and a collar loosely mounted upon the stem between the. stationary and movable abutments and rigidly supported from the hollow head. a

In testimony whereof I afix my signature in presence oftwo witnesses.

HENRY E. HANSON.

Witnesses:

' E. C. BRUNDIGE,

TELLMAN FoR'rNEY. 

